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HARLINGEN WATER WORKS SYSTEM

PWS ID: TX0310002 · HARLINGEN, Texas 78550-9116

PFAS Detected

4 PFAS "forever chemicals" detected in testing under EPA's UCMR5 monitoring program.

Population Served
85,900
Total Violations
6
Health-Based Violations
0
Water Source
Surface Water

System Details

System Type
Community
Owner Type
Local
Connections
37,154
County
Cameron
School/Daycare
No
MCL Violations
0
Monitoring Violations
5
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Revised Total Coliform Rule MON 4 2020
Surface Water Treatment Rule MR 1 1993

PFAS Testing Results (UCMR5)

Results from EPA's Fifth Unregulated Contaminant Monitoring Rule. 15 of 240 samples detected PFAS.

Contaminant Date Result MRL Status
PFUnA 8/14/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFDA 8/14/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDoA 8/14/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHxA 8/14/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFHpS 8/14/2023 <0.003 µg/L 0.003 µg/L Not Detected
11Cl-PF3OUdS 8/14/2023 <0.005 µg/L 0.005 µg/L Not Detected
9Cl-PF3ONS 8/14/2023 <0.002 µg/L 0.002 µg/L Not Detected
ADONA 8/14/2023 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 8/14/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFPeS 8/14/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFMBA 8/14/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFNA 8/14/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFEESA 8/14/2023 <0.003 µg/L 0.003 µg/L Not Detected
4:2 FTS 8/14/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFPeA 8/14/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 8/14/2023 <0.004 µg/L 0.004 µg/L Not Detected
8:2 FTS 8/14/2023 <0.005 µg/L 0.005 µg/L Not Detected
6:2 FTS 8/14/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFBA 8/14/2023 0.0088 µg/L 0.005 µg/L Detected
PFOS 8/14/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFHpA 8/14/2023 <0.003 µg/L 0.003 µg/L Not Detected
NMeFOSAA 8/14/2023 <0.006 µg/L 0.006 µg/L Not Detected
NEtFOSAA 8/14/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFTrDA 8/14/2023 <0.007 µg/L 0.007 µg/L Not Detected
PFTA 8/14/2023 <0.008 µg/L 0.008 µg/L Not Detected
lithium 8/14/2023 39.6000 µg/L 9 µg/L Detected
NFDHA 8/14/2023 <0.02 µg/L 0.02 µg/L Not Detected
PFHxS 8/14/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 8/14/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFBS 8/14/2023 <0.003 µg/L 0.003 µg/L Not Detected
HFPO-DA 8/14/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFDoA 8/14/2023 <0.003 µg/L 0.003 µg/L Not Detected
ADONA 8/14/2023 <0.003 µg/L 0.003 µg/L Not Detected
9Cl-PF3ONS 8/14/2023 <0.002 µg/L 0.002 µg/L Not Detected
11Cl-PF3OUdS 8/14/2023 <0.005 µg/L 0.005 µg/L Not Detected
PFUnA 8/14/2023 <0.002 µg/L 0.002 µg/L Not Detected
PFHxA 8/14/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFDA 8/14/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFOA 8/14/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFOS 8/14/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFNA 8/14/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFHxS 8/14/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFBS 8/14/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFBA 8/14/2023 0.0078 µg/L 0.005 µg/L Detected
PFHpA 8/14/2023 <0.003 µg/L 0.003 µg/L Not Detected
lithium 8/14/2023 42.6000 µg/L 9 µg/L Detected
PFPeA 8/14/2023 <0.003 µg/L 0.003 µg/L Not Detected
PFMPA 8/14/2023 <0.004 µg/L 0.004 µg/L Not Detected
PFEESA 8/14/2023 <0.003 µg/L 0.003 µg/L Not Detected
8:2 FTS 8/14/2023 <0.005 µg/L 0.005 µg/L Not Detected
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. PFAS data from EPA UCMR5 monitoring program (2023-2025). This data is provided for informational purposes only.